Lightweight upper receiver



FIG. 1 is an upper, rear perspective view of a first exemplary embodiment of the lightweight upper receiver, showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a rear view thereof;

FIG. 8 is a left, front perspective view thereof;

FIG. 9 is a right, front perspective view thereof;

FIG. 10 is a left, side perspective view thereof;

FIG. 11 is a left, rear perspective view thereof; and,

FIG. 12 is a left, top perspective view thereof. 

CLAIM The ornamental design for a lightweight upper receiver, as shown and described. 